From 3944a5a0387e4a686aac2033c13153d8cc340c33 Mon Sep 17 00:00:00 2001
From: Andreas Hocevar <andreas.hocevar@gmail.com>
Date: Wed, 4 Mar 2020 15:59:52 +0100
Subject: [PATCH] Make DEVICE_PIXEL_RATIO work in non-window context

---
 src/ol/has.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/ol/has.js b/src/ol/has.js
index bfc8aabef3..9bf3e354bf 100644
--- a/src/ol/has.js
+++ b/src/ol/has.js
@@ -37,7 +37,13 @@ export const MAC = ua.indexOf('macintosh') !== -1;
  * @type {number}
  * @api
  */
-export const DEVICE_PIXEL_RATIO = window.devicePixelRatio || 1;
+export const DEVICE_PIXEL_RATIO = (function() {
+  try {
+    return self.devicePixelRatio;
+  } catch (e) {
+    return window.devicePixelRatio || 1;
+  }
+})();
 
 /**
  * Image.prototype.decode() is supported.